CN206461609U - A kind of superhet and improve its accuracy of measurement device - Google Patents
A kind of superhet and improve its accuracy of measurement device Download PDFInfo
- Publication number
- CN206461609U CN206461609U CN201621485366.3U CN201621485366U CN206461609U CN 206461609 U CN206461609 U CN 206461609U CN 201621485366 U CN201621485366 U CN 201621485366U CN 206461609 U CN206461609 U CN 206461609U
- Authority
- CN
- China
- Prior art keywords
- superhet
- power
- calibration
- unit
- attenuation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Abstract
The utility model discloses a kind of superhet and the device of its accuracy of measurement is improved, the device includes decay amount detection unit, calibration of power unit and power compensating unit；Decay amount detection unit is used to detect superhet when measuring measured piece, the attenuation of the programmable attenuator of superhet；Calibration of power unit is used for by the attenuation for the programmable attenuator for adjusting superhet, detects and records superhet corresponding calibration of power value under some particular decay amounts；Power compensating unit is used for the attenuation measured according to decay amount detection unit, and the calibration of power value of calibration of power unit record carries out gain compensation to superhet, so as to improve the degree of accuracy of superhet power measurement in impedance mismatching, due to not increasing any extra circuit in the signal path that superhet measures measured piece, also Insertion Loss would not be introduced, and time delay will not be increased.
Description
Technical field
The utility model is related to measuring instrument technical field, and in particular to a kind of superhet and to improve its measurement accurate
The device of exactness.
Background technology
The radio frequency path of superhet is 50 Ohms systems, due to many measured piece (Device in consumer electronics
Under Test, DUT) port Impedance deviates 50 ohm sometimes, causes the power that superhet is measured with program control decay
It is different and different that device is set.
Fig. 1 is a kind of functional block diagram of existing typical superhet, as shown in figure 1, causing superhet
The power of measurement with programmable attenuator set it is different and different the reason for be programmable attenuator in superhet port
Port standing wave of the standing wave often than converter unit is good.The radiofrequency signal of measured piece enters superhet, has first passed through program control
Attenuator, enters back into converter unit, and intermediate frequency compensation and alignment unit are entered afterwards, ADC digital processing unit is finally entered.It is super outer
The attenuation that the intermediate frequency compensation of poor reception machine and alignment unit can compensate programmable attenuator automatically is ensured into ADC input ports
Signal power keeps constant.When programmable attenuator is unattenuated, the radiofrequency signal of measured piece is directly entered converter unit, due to frequency conversion
The port standing wave of unit is not ideal enough to increase insertion loss, and the power that superhet is measured is relatively low.Work as programmable attenuator
When attenuation increases, the isolation between measured piece port and converter unit is improved, because programmable attenuator port standing wave is good,
Even if the impedance of measured piece deviates 50 ohm, insertion loss also will not substantially increase, but increase decay can reduce and measure sensitive
Degree.
Measure the problem of power is inaccurate because of impedance mismatching to solve superhet, currently existing scheme mainly include with
Lower three kinds：
The first, increases match circuit, non-50 ohm of measured pieces is matched into 50 ohm, then use superhet measurement of power
Rate.But increase match circuit can introduce Insertion Loss, increase time delay, and when signal bandwidth increase, the complexity meeting of match circuit
Rise.
Second, increase isolator between measured piece and superhet, improve measured piece and superhet
Between match condition, improve power measurement accuracy.Although matching between measured piece and superhet can be increased,
Still power loss may be caused due to mismatch between measured piece and isolator.
The third, increases the attenuation of superhet, improves the power measurement degree of accuracy.Connect due to adding superhet
The attenuation of receipts machine, can improve the power measurement degree of accuracy, but when signal power is smaller, it is sensitive that increase decay can reduce measurement
Degree, it is easily affected by noise during measurement power.
Utility model content
The utility model provides a kind of superhet and improves the device of its accuracy of measurement, to solve superhet
Receiver measures the problem of power is inaccurate because of impedance mismatching, improves the accuracy of measurement of superhet, it is to avoid existing solution
The problems such as certainly increasing path Insertion Loss or time delay in scheme.
According to one side of the present utility model, the utility model provides a kind of superhet that improves and measures accurate
The device of degree, including：Decay amount detection unit, calibration of power unit and power compensating unit；
The decay amount detection unit, for detecting superhet when measuring measured piece, superhet
The attenuation of programmable attenuator；
The calibration of power unit, for the attenuation of the programmable attenuator by adjusting superhet, detection is simultaneously
Record superhet corresponding calibration of power value under some particular decay amounts；
The power compensating unit, for the attenuation measured according to the decay amount detection unit, and the power
The calibration of power value of alignment unit record carries out gain compensation to superhet.
According to other side of the present utility model, the utility model provides a kind of superhet, including improves
The device of superhet accuracy of measurement；
The device for improving superhet accuracy of measurement includes：Decay amount detection unit, calibration of power unit
And power compensating unit；
The decay amount detection unit, for detecting superhet when measuring measured piece, superhet
The attenuation of programmable attenuator；
The calibration of power unit, for the attenuation of the programmable attenuator by adjusting superhet, detection is simultaneously
Record superhet corresponding calibration of power value under some particular decay amounts；
The power compensating unit, for the attenuation measured according to the decay amount detection unit, and the power
The calibration of power value of alignment unit record carries out gain compensation to superhet.
The beneficial effects of the utility model are：The utility model embodiment is by adjusting the program control decay of superhet
The attenuation of device, detects and records superhet corresponding calibration of power value under some particular decay amounts；Then super
During heterodyne reciver measurement measured piece, the attenuation of programmable attenuator is detected, and utilize corresponding with attenuation now
Calibration of power value to superhet carry out gain compensation, so as to improve superhet power in impedance mismatching
The degree of accuracy of measurement, due to not increasing any extra circuit in the signal path that superhet measures measured piece,
Also Insertion Loss would not be introduced, and time delay will not be increased.
Brief description of the drawings
Fig. 1 is a kind of functional block diagram of existing typical superhet；
Fig. 2 is a kind of device for raising superhet accuracy of measurement that the utility model one embodiment is provided
Functional block diagram；
Fig. 3 is a kind of functional block diagram for superhet that the utility model one embodiment is provided.
Embodiment
Design concept of the present utility model is：The radio frequency path of superhet is 50 Ohms systems, due to measured piece
Port Impedance deviates 50 ohm sometimes, cause the power that superhet is measured with programmable attenuator set it is different without
Together, the degree of accuracy of power measurement is influenceed, and existing several solution can increase path Insertion Loss or time delay.For this feelings
Condition, the utility model detects by adjusting the attenuation of the programmable attenuator of superhet and records superhet
The corresponding calibration of power value under some particular decay amounts, such as 0dB, 1dB, 2dB ..., the corresponding calibration of power values of NdB；So
Afterwards during superhet measurement measured piece, the attenuation of programmable attenuator is detected, and utilize and decay now
Measure corresponding calibration of power value and gain compensation is carried out to superhet, so as to improve superhet in impedance mismatching
When power measurement the degree of accuracy, it is any extra due to not increasing in the signal path that superhet measures measured piece
Circuit, would not also introduce Insertion Loss, and will not increase time delay.
Embodiment one
Fig. 2 is a kind of device for raising superhet accuracy of measurement that the utility model one embodiment is provided
Functional block diagram, as depicted in figs. 1 and 2, the device for the raising superhet accuracy of measurement that the present embodiment is provided include declining
Decrement detection unit 210, calibration of power unit 220 and power compensating unit 230.
Superhet is when measuring measured piece, and decay detection the program control of superhet of amount detection unit 210 declines
Subtract the attenuation of device；Calibration of power unit 220 is detected and remembered by adjusting the attenuation of the programmable attenuator of superhet
Record superhet corresponding calibration of power value under some particular decay amounts；Power compensating unit 230 is examined according to attenuation
The attenuation that unit 210 is measured is surveyed, and the calibration of power value that calibration of power unit 220 is recorded increases to superhet
Benefit compensation, the degree of accuracy of measurement power can be effectively improved in superhet impedance mismatching, and the present embodiment does not have
Increase any extra circuit in the signal path that superhet measures measured piece, would not also introduce Insertion Loss, and
Time delay will not be increased.
In a preferred embodiment, the prevention at radio-frequency port of measured piece is being connected to the rf inputs mouthful of superhet simultaneously
After measured piece and superhet power-up work, calibration of power unit 220 is first by the program control decay of superhet
The attenuation of device is set to a larger preset value, is designated as NdB, and by the frequency and bandwidth of superhet be set to by
Survey the corresponding working frequency of part and bandwidth.Then, alignment unit 220 reads the work(of measured piece signal using superhet
Rate, is used as reference power.Specifically, it is possible to use the peak value frequency marking function of superhet reads the power of signal, is designated as
P0 (dBm), recycles the relative frequency marking function of superhet to regard P0 as reference power.Finally, calibration of power unit 220
The attenuation of the programmable attenuator of superhet is gradually reduced from the larger preset value of setting, in this course,
Superhet corresponding power detection value under some particular decay amounts is recorded, will be program control as corresponding calibration of power value
The attenuation of attenuator.Specifically, 0dB can be gradually decreased to from the NdB of setting using 1dB as stepping, and often reduces 1dB,
Calibration of power unit 220 records the power detection value of superhet, as calibration of power value, the PN that P1, P2 is designated as respectively ....
Further, the attenuation of the programmable attenuator of superhet is set to automatically by power compensating unit 230
Adjustment.When input signal power increase to a certain extent when, gain reduction can be made and cause power output be in non-linear increase,
In order to avoid producing in this gain compression, preferred embodiment, during superhet measurement measured piece, according to quilt
The reference level value of the change adjustment superhet of part signal amplitude is surveyed, superhet is not produced gain compression.
With the change of superhet datum, the attenuation of programmable attenuator can adjust automatically.Now, attenuation detection is single
Member 210 detects the attenuation of superhet programmable attenuator, is designated as MdB.Power compensating unit 230 calculates decay now
Relative value between amount and preset value NdB, i.e. (N-M) dB, wherein N>M.Afterwards, power compensating unit 230 is from calibration of power list
Corresponding calibration of power value P is inquired about in the calibration of power value of the record of member 220N-MDB, and utilize calibration of power value PN-MDB modifications are super
The intermediate frequency compensation of heterodyne reciver and the gain compensation value of alignment unit, power is subtracted by the automatic gain compensation value MdB of script
Calibration value PN-MDB, i.e., be changed to (M- by the automatic gain compensation value of the compensation of superhet intermediate frequency and alignment unit by MdB
PN-M) dB, so as to complete to measure superhet the compensation for calibrating errors of power, improve superhet power measurement accurate
Exactness.
Embodiment two
Fig. 3 is a kind of functional block diagram for superhet that the utility model one embodiment is provided, as shown in figure 3,
The superhet 300 that the present embodiment is provided includes the raising superhet accuracy of measurement in above-described embodiment one
Device 200.
Amount detection unit 210 of decaying detects the attenuation of the programmable attenuator of superhet 300；Calibration of power unit
220 by the attenuation for the programmable attenuator for adjusting superhet 300, exists if detecting and recording superhet 300
Corresponding calibration of power value under dry particular decay amount；The decay that power compensating unit 230 is measured according to decay amount detection unit 210
Amount, and the calibration of power value that calibration of power unit 220 is recorded carry out gain compensation to superhet 300, in superhet
The degree of accuracy of measurement power can be effectively improved during 300 impedance mismatching of receiver, and the present embodiment is not in superheterodyne reception
Increase any extra circuit in the signal path of machine measurement measured piece, would not also introduce Insertion Loss, and time delay will not be increased.
In a preferred embodiment, the prevention at radio-frequency port of measured piece is being connected to the rf inputs mouthful of superhet simultaneously
After measured piece and superhet power-up work, calibration of power unit 220 is first by the program control decay of superhet
The attenuation of device is set to a larger preset value, is designated as NdB, and by the frequency and bandwidth of superhet be set to by
Survey the corresponding working frequency of part and bandwidth.Then, alignment unit 220 reads the work(of measured piece signal using superhet
Rate, is used as reference power.Specifically, it is possible to use the peak value frequency marking function of superhet reads the power of signal, is designated as
P0 (dBm), recycles the relative frequency marking function of superhet to regard P0 as reference power.Finally, calibration of power unit 220
The attenuation of the programmable attenuator of superhet is gradually reduced from the larger preset value of setting, superheterodyne reception is recorded
Machine corresponding power detection value under some particular decay amounts, as corresponding calibration of power value by the decay of programmable attenuator
Amount, for example, can gradually decrease to 0dB, and often reduce 1dB, calibration of power unit 220 using 1dB as stepping from the NdB of setting
Record the power detection value of superhet, as calibration of power value, the PN that P1, P2 is designated as respectively ....
The attenuation of the programmable attenuator of superhet is set to adjust automatically by power compensating unit 230.When defeated
When entering the power increase of signal to a certain extent, gain reduction can be made and cause power output to be in non-linear increase, in order to avoid
Gain compression, during superhet measurement measured piece, superhet is adjusted according to the change of measured piece signal amplitude
The reference level value of receiver, makes superhet not produce gain compression.With the change of superhet datum
Change, the attenuation of programmable attenuator can adjust automatically.Now, decay amount detection unit 210 detects that superhet is program control and declined
Subtract the attenuation of device, be designated as MdB.Power compensating unit 230 calculates the relative value between attenuation now and preset value NdB,
That is (N-M) dB, wherein N>M.Afterwards, inquired about in the calibration of power value that power compensating unit 230 is recorded from calibration of power unit 220
Corresponding calibration of power value PN-MDB, and utilize the intermediate frequency compensation and calibration of calibration of power value PN-MdB modification superhets
The gain compensation value of unit, calibration of power value P is subtracted by the automatic gain compensation value MdB of scriptN-MDB, i.e., by superheterodyne reception
Machine intermediate frequency is compensated and the automatic gain compensation value of alignment unit is changed to (M-P by MdBN-M) dB, so as to complete to superheterodyne reception
Machine measures the compensation for calibrating errors of power, improves the superhet power measurement degree of accuracy, and will not introduce Insertion Loss, also will not
Increase time delay.
It is described above, embodiment only of the present utility model, under above-mentioned teaching of the present utility model, this area
Technical staff can carry out other improvement or deformation on the basis of above-described embodiment.It will be understood by those skilled in the art that
Above-mentioned specific descriptions are more preferable explanation the purpose of this utility model, and protection domain of the present utility model should be with claim
Protection domain be defined.
Claims (8)
1. a kind of device for improving superhet accuracy of measurement, it is characterised in that including：Decay amount detection unit, work(
Rate alignment unit and power compensating unit；
The decay amount detection unit, for detect superhet measure measured piece when, superhet it is program control
The attenuation of attenuator；
The calibration of power unit, for the attenuation of the programmable attenuator by adjusting superhet, detects and records
Superhet corresponding calibration of power value under some particular decay amounts；
The power compensating unit, for the attenuation measured according to the decay amount detection unit, and the calibration of power
The calibration of power value of unit record carries out gain compensation to superhet.
2. device as claimed in claim 1, it is characterised in that the calibration of power unit specifically for：
The attenuation of the programmable attenuator of superhet is set to preset value；Measured piece is read using superhet
The power of signal, is used as reference power；The attenuation of the programmable attenuator of superhet is gradually subtracted from the preset value
It is small, superhet corresponding power detection value under some particular decay amounts is recorded, corresponding calibration of power value is used as.
3. device as claimed in claim 1, it is characterised in that the power compensating unit specifically for：By superheterodyne reception
The attenuation of the programmable attenuator of machine is set to adjust automatically；Superhet is obtained when measuring measured piece, superhet connects
The attenuation of the programmable attenuator of receipts machine；Intermediate frequency compensation and the gain compensation value of alignment unit of superhet are changed, will
Automatic gain compensation value subtracts calibration of power value corresponding with the attenuation of the programmable attenuator.
4. device as claimed in claim 2 or claim 3, it is characterised in that the power compensating unit is additionally operable to：In superheterodyne reception
During machine measurement measured piece, the reference level value of superhet is adjusted according to the change of measured piece signal amplitude, made
Superhet does not produce gain compression.
5. a kind of superhet, including the compensation of programmable attenuator, converter unit, intermediate frequency and alignment unit, ADC digital processing
Unit, it is characterised in that also include the device of raising superhet accuracy of measurement；
The device for improving superhet accuracy of measurement includes：Decay amount detection unit, calibration of power unit and work(
Rate compensating unit；
The decay amount detection unit, for detect superhet measure measured piece when, superhet it is program control
The attenuation of attenuator；
The calibration of power unit, for the attenuation of the programmable attenuator by adjusting superhet, detects and records
Superhet corresponding calibration of power value under some particular decay amounts；
The power compensating unit, for the attenuation measured according to the decay amount detection unit, and the calibration of power
The calibration of power value of unit record carries out gain compensation to superhet.
6. superhet as claimed in claim 5, it is characterised in that the calibration of power unit specifically for：
The attenuation of the programmable attenuator of superhet is set to preset value；Measured piece is read using superhet
The power of signal, is used as reference power；The attenuation of the programmable attenuator of superhet is gradually subtracted from the preset value
It is small, superhet corresponding power detection value under some particular decay amounts is recorded, corresponding calibration of power value is used as.
7. superhet as claimed in claim 5, it is characterised in that the power compensating unit specifically for：
The attenuation of the programmable attenuator of superhet is set to adjust automatically；Superhet is obtained in measurement quilt
When surveying part, the attenuation of the programmable attenuator of superhet；Change intermediate frequency compensation and the alignment unit of superhet
Gain compensation value, automatic gain compensation value is subtracted into calibration of power value corresponding with the attenuation of the programmable attenuator.
8. superhet as claimed in claims 6 or 7, it is characterised in that the power compensating unit is additionally operable to：Super
During heterodyne reciver measurement measured piece, the reference electricity of superhet is adjusted according to the change of measured piece signal amplitude
Level values, make superhet not produce gain compression.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621485366.3U CN206461609U (en) | 2016-12-31 | 2016-12-31 | A kind of superhet and improve its accuracy of measurement device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621485366.3U CN206461609U (en) | 2016-12-31 | 2016-12-31 | A kind of superhet and improve its accuracy of measurement device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206461609U true CN206461609U (en) | 2017-09-01 |
Family
ID=59696714
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621485366.3U Active CN206461609U (en) | 2016-12-31 | 2016-12-31 | A kind of superhet and improve its accuracy of measurement device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206461609U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109687906A (en) * | 2019-01-25 | 2019-04-26 | 泰瑞创通讯(成都)有限公司 | Optical attenuator calibration method |
| CN110850217A (en) * | 2019-11-28 | 2020-02-28 | 中电科仪器仪表有限公司 | Signal receiving channel state self-detection device and method |
| CN111934636A (en) * | 2020-09-18 | 2020-11-13 | 深圳市鼎阳科技股份有限公司 | Attenuator calibration device and method |
| CN112994807A (en) * | 2021-02-05 | 2021-06-18 | 成都中科四点零科技有限公司 | Automatic calibration system and method for signal source |
-
2016
- 2016-12-31 CN CN201621485366.3U patent/CN206461609U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109687906A (en) * | 2019-01-25 | 2019-04-26 | 泰瑞创通讯(成都)有限公司 | Optical attenuator calibration method |
| CN110850217A (en) * | 2019-11-28 | 2020-02-28 | 中电科仪器仪表有限公司 | Signal receiving channel state self-detection device and method |
| CN110850217B (en) * | 2019-11-28 | 2021-08-17 | 中电科仪器仪表有限公司 | Signal receiving channel state self-detection device and method |
| CN111934636A (en) * | 2020-09-18 | 2020-11-13 | 深圳市鼎阳科技股份有限公司 | Attenuator calibration device and method |
| CN112994807A (en) * | 2021-02-05 | 2021-06-18 | 成都中科四点零科技有限公司 | Automatic calibration system and method for signal source |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN206461609U (en) | A kind of superhet and improve its accuracy of measurement device | |
| US6268735B1 (en) | Noise source module for microwave test systems | |
| US9641146B2 (en) | Apparatus and method for detecting radio frequency power | |
| CN105929222B (en) | Suitable for the test system and method for high steady RF signal power stability | |
| US20080191712A1 (en) | System, Device, and Method for Embedded S-Parameter Measurement | |
| GB2426067A (en) | Power calibration for a multi-port vector network analyser | |
| US8803505B2 (en) | Transmitter calibration system | |
| US5072189A (en) | Scalar network analyzer | |
| CN106849982A (en) | A kind of superhet and the method and apparatus for improving its accuracy of measurement | |
| CN101674141A (en) | Method and device for detecting radio frequency feed line loss | |
| US3968697A (en) | Sound level meter | |
| Ferrero et al. | Accuracy evaluation of on-wafer load-pull measurements | |
| CN108847902A (en) | A kind of measuring circuit and measurement method of noise power | |
| CN209356587U (en) | A kind of radio-frequency antenna standing wave self-check system | |
| JP4527939B2 (en) | Signal measurement | |
| CN105445549B (en) | A kind of weak electromagnetic signal frequency spectrum measuring method | |
| CN110057546A (en) | A kind of low cost simple light eye figure measurement method for extinction ratio and system | |
| CN115060982A (en) | Active near-field composite probe, detection device and calibration method of probe | |
| US20050261880A1 (en) | Noise compensation for spectrum analyzer | |
| JP3456202B2 (en) | Receive level monitor circuit | |
| CN103595493B (en) | Device and method for improving sensitivity and dynamic range of broadband signal analytical instrument | |
| CN103543427B (en) | Passive cross modulation test system calibration steps and device based on intelligent search algorithm | |
| CN106301269B (en) | A kind of vector network analyzer intermediate-frequency gain Automatic adjustment method | |
| CN109406885A (en) | A kind of radio-frequency antenna standing wave self-sensing method and system | |
| CN209072508U (en) | The adjustable fixed attenuation equipment of tape test function |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |